portal bracing
portal bracing
(OP)
can any one provide me with a design refrence/book/example if a building with a portal bracing system in it.
will the portal column help in the axial load capacity?? and what is the best way to model this system in staad??
will the portal column help in the axial load capacity?? and what is the best way to model this system in staad??
ôIf you don't build your dream someone will hire you to help build theirs.ö
Tony A. Gaskins Jr.






RE: portal bracing
RE: portal bracing
I am not talikng about simple moment frames.
I.am.asking about the portal bracing wich is the practise of adding a rotated column near the main column to be used as a lateral bracing in the minor axis of the main column.
ôIf you don't build your dream someone will hire you to help build theirs.ö
Tony A. Gaskins Jr.
RE: portal bracing
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: portal bracing
RE: portal bracing
DaveAtkins
RE: portal bracing
The added capacity would only help if the main column would be helped by a smaller unbraced length L (as in a reduced kL/r value).
This would be a brace system that AISC appendix 6 covers for columns. The portal column would have to provide adequate strength and stiffness to do any good (per App 6).
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RE: portal bracing
DaveAtkins
RE: portal bracing
RE: portal bracing
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RE: portal bracing
The thing is I am designing a multistory building with portal bracing and because there is a huge axial load on the columns I am thinking of using a star shaped columns instead of the regular portal brace system to increase the axial capacity .
Any comments or advice guys??
ôIf you don't build your dream someone will hire you to help build theirs.ö
Tony A. Gaskins Jr.
RE: portal bracing
Star shapes sounds odd and therefore expensive. Cruciform shapes are an option made with two W sections. Best advice, use a different system lateral system. unless you are 6+ stories you shouldn't need this, and if you are that big you shouldn't be learning on the job without some supervision.